what would you do in practice in regard to selecting the frequency in use??
What about if the strip is near an Area Freq boundary?
What about if it is located outside the coverage of a VNC and you have to plot the boundary in flight from another chart or ERC?
What about if the strip is not on your WAC, but on your iPad?
What about if you can hear the high flyers, but not Centre?
What would you do in those situations, exercising common sense and IAW AIP?